On the notch fatigue strength of additively manufactured polylactide (PLA)

Ezeh, O.H.; Susmel, Luca

doi:10.1016/j.ijfatigue.2020.105583

Cited by 44 publications

(28 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering applications of 3D-printed components, their structural integrity become an important issue. Hence, fracture behavior of these parts are investigated in several studies 15 – 20 . In Ref.…”

Section: Introductionmentioning

confidence: 99%

Characterization of 3D-printed PLA parts with different raster orientations and printing speeds

Khosravani

Berto

Ayatollahi

et al. 2022

Sci Rep

View full text Add to dashboard Cite

Fabrication based on additive manufacturing (AM) process from a three-dimensional (3D) model has received significant attention in the past few years. Although 3D printing was introduced for production of prototypes, it has been currently used for fabrication of end-use products. Therefore, the mechanical behavior and strength of additively manufactured parts has become of significant importance. 3D printing has been affected by different parameters during preparation, printing, and post-printing processes, which have influence on quality and behavior of the additively manufactured components. This paper discusses the effects of two printing parameters on the mechanical behavior of additively manufactured components. In detail, polylactic acid material was used to print test coupons based on fused deposition modeling process. The specimens with five different raster orientations were printed with different printing speeds. Later, a series of tensile tests was performed under static loading conditions. Based on the results, strength and stiffness of the examined specimens have been determined. Moreover, dependency of the strength and elastic modulus of 3D-printed parts on the raster orientation has been documented. In the current study, fractured specimens were visually investigated by a free-angle observation system. The experimental findings can be used for the development of computational models and next design of structural components.

show abstract

Section: Introductionmentioning

confidence: 99%

Characterization of 3D-printed PLA parts with different raster orientations and printing speeds

Khosravani

Berto

Ayatollahi

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Fatigue strength of PLA was investigated by Ezeh and Susmel. 60 This work showed that, in 3 Dprinted polymers, fatigue cracks follow irregular paths which retrace the orientation of the extruded filaments. Besides, TCD exhibited its capabilities to assess notch fatigue strength.…”

Section: Applications Of Tcdmentioning

confidence: 90%

Theory of critical distances: A discussion on concepts and applications

Delprete

Maggio

Sesana

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

Theory of Critical Distances (TCD) collects several methods adopted in failure prediction of components provided with stress concentration features. The idea of evaluating stress effect in a zone rather than in a single point was proposed decades ago but, only thanks to relatively recent works, TCD concepts showed to be a successful extension of Linear Elastic Fracture Mechanics (LEFM), able to assess strength and fatigue life. The increasing computational power has made Finite Element Method (FEM) widespread, hence stress fields can be easily extracted and used as input data for fatigue post-processing and durability analyses. In this scenario, TCD reveals as a powerful tool which, thanks to the introduction of a single material parameter (critical distance, [Formula: see text]), integrates classical fracture models by considering the presence of microscale phenomena acting in fracture process. In this sense, TCD behaves as a link between continuum mechanics and LEFM. Modalities and reasons for this connection to occur are interesting points of further investigations. Literature on TCD and its theoretical-experimental background is quite extended, nevertheless few industrial applications are available in literature to the best of authors’ knowledge. In this paper, an overview of concepts and applications related to TCD are reported highlighting the relevance of theoretical arguments in actual applications.

show abstract

“…With reference to the mentioned works, FFF could offer enhanced fatigue lifetime of the final part in comparison with the traditional manufacturing processes [ 26 , 27 , 28 ]. The effect of print orientation on fatigue lifetime of 3D-printed ABS samples has been considered by Lee and Huang [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

An Investigation to Study the Effect of Process Parameters on the Strength and Fatigue Behavior of 3D-Printed PLA-Graphene

et al. 2021

View full text Add to dashboard Cite

3D printing, an additive manufacturing process, draws particular attention due to its ability to produce components directly from a 3D model; however, the mechanical properties of the produced pieces are limited. In this paper, we present, from the experimental aspect, the fatigue behavior and damage analysis of polylactic acid (PLA)-Graphene manufactured using 3D printing. The main purpose of this paper is to analyze the combined effect of process parameters, loading amplitude, and frequency on fatigue behavior of the 3D-printed PLA-Graphene specimens. Firstly, a specific case study (single printed filament) was analyzed and compared with spool material for understanding the nature of 3D printing of the material. Specific experiments of quasi-static tensile tests are performed. A strong variation of fatigue strength as a function of the loading amplitude, frequency, and process parameters is also presented. The obtained experimental results highlight that fatigue lifetime clearly depends on the process parameters as well as the loading amplitude and frequency. Moreover, when the frequency is 80 Hz, the coupling effect of thermal and mechanical fatigue causes self-heating, which decreases the fatigue lifetime. This paper comprises useful data regarding the mechanical behavior and fatigue lifetime of 3D-printed PLA-Graphene specimens. In fact, it evaluates the effect of process parameters based on the nature of this process, which is classified as a thermally-driven process.

show abstract

On the notch fatigue strength of additively manufactured polylactide (PLA)

Cited by 44 publications

References 21 publications

Characterization of 3D-printed PLA parts with different raster orientations and printing speeds

Characterization of 3D-printed PLA parts with different raster orientations and printing speeds

Theory of critical distances: A discussion on concepts and applications

An Investigation to Study the Effect of Process Parameters on the Strength and Fatigue Behavior of 3D-Printed PLA-Graphene

Contact Info

Product

Resources

About